package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetMealMapper setMealMapper;

    /**
     * 分类分页
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult page(CategoryPageQueryDTO categoryPageQueryDTO) {
        // 开启分页
        PageHelper.startPage(categoryPageQueryDTO.getPage(), categoryPageQueryDTO.getPageSize());
        Page<Category> page = categoryMapper.page(categoryPageQueryDTO);

        long total = page.getTotal();
        List<Category> records = page.getResult();

        return new PageResult(total, records);
    }

    /**
     * 启用禁用分类
     * @param status
     * @param id
     */
    public void status(Integer status, Long id) {
        Category category = Category.builder()
                .status(status)
                .id(id)
                //.updateTime(LocalDateTime.now())
                //.updateUser(BaseContext.getCurrentId())
                .build();
        categoryMapper.update(category);
    }

    /**
     * 新增分类
     * @param categoryDTO
     */
    public void addCategory(CategoryDTO categoryDTO) {
        // 拷贝对象属性
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO, category);

        // 分类状态默认为禁用
        category.setStatus(StatusConstant.DISABLE);
        // 设置创建时间、更新时间、创建人、修改人
        //category.setCreateTime(LocalDateTime.now());
        //category.setUpdateTime(LocalDateTime.now());
        //category.setCreateUser(BaseContext.getCurrentId());
        //category.setUpdateUser(BaseContext.getCurrentId());

        categoryMapper.addCategory(category);
    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void delCategoryById(Long id) {
        // 查询分类是否关联了菜品
        Integer count = dishMapper.countByCategoryId(id);
        if (count >0 ) {
            // 该分类关联了菜品，抛出异常
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        // 查询分类是否关联了套餐
        count = setMealMapper.countByCategoryId(id);
        if (count > 0) {
            // 该分类关联了套餐，抛出异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除分类
        categoryMapper.delCategoryById(id);
    }

    /**
     * 根据类型查询分类
     * @param type
     * @return
     */
    public List<Category> getByType(Integer type) {
        return categoryMapper.getByType(type);
    }
}












